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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df89edf060861e7eff5899cae68a134ca9a5241b865b7c36320303fb39fb0a07' 
  AND token = 'sFPgpv87RPJuRMlzLrIL0cpat1gYxwqufv4oJJ+r8z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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