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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5985e58cc264d67240013bfc5cffbd95c3a570b39a0a74a03874e534198eed7' 
  AND token = '8jt/9D+NXKJ9cscEYWk3RpZ7wV16yRkc2bALxOXGXnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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