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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1894dea18ec91b3f7bbfcddb9560da561885a9046bc48d53662d00b3b982903' 
  AND token = '6i3liaaBAfTIzzg4NAZkvfSlWjjQlhVHctCbgU8q02c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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