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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c2e0bae62fcb95fa25aa1defd261d225f29b0d530c0a94c2c5e8a5eb2261e0' 
  AND token = 'sAJ/otu/B4YoCPJQaIbWrF7aMVcYYGpCQ5ct/ANsR74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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