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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ac27b42ccc9619bc437de1e0f82107123f349536fd1fc3a17ad2df1424f12c' 
  AND token = 'IjdiY5GvTIaQ8oSkpletTOWpj1nz5p+wnLtBfaC+wEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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