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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a3c30c664e909ab758f563333922841deb8ff91203c278b73edc1979700649' 
  AND token = 'bB6OHrr4cSwtrgqBgtKq2UlN2JTN5z8qR0D8D9Xbnl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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