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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1347e9087dfa5767bb781d6701f08d3508859ff718757d09f071040a00f8e05c' 
  AND token = 'HlZ8HjH7Pd+bic59eF6l7vOaF47Ln2CIzJJWRP1qupI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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