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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca9d938631ad699d3895f28a66e0b5658f0a52db11ba24058fc533ec59f2b68' 
  AND token = 'ryRZhItCfBcNqDjtarIZsUTrK/Po7DnynAl+eMG8eJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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