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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f902592d38b88e57c2f4dce9a444ddff76733e642c955c6366d49eedc54b732' 
  AND token = 'iKe4lKYIbyS8KMbbETx+hL6oiQuArwxJT3D1aF4IeoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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