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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807308d0e5c9e1a9b7f817af6664baeb45d337b0f7a906c9aae6ab0778e65c8a' 
  AND token = '3vV890vb0Mgo1ff2/M7CQuiC6RYPQcodKiaLB37SLCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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