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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e59027b54480b5e272cf166af4928dd850ddd038d900b8d84d5a627a27d1697' 
  AND token = 'paa1+W6fut2PI6UvFaU7S+8j19z2ULos9dnXBPo3rxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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