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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6bd2e4222194a298a3b528df4806aa9bd3f4e2cf3f1560850da0b27aecd30b' 
  AND token = '59nt12QqTkjltnKbm1kh91tvZ1Bi1YRgJvSuvm3gclI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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