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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8886d295baba96a38ec4f84a982e643f396af829b53f20bfc0553987154c9d85' 
  AND token = '/C+MKLW7OFl+ep9+TP1Ci1JZ3tpdzeQgPFoRitHu+og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}