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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e0e31bfa5f0272805a27dc15ddf3717bc986f85c5f070f03a513fee62fe9ad' 
  AND token = '+C2yiDRhvQTPga3Ddh8OzircxU3aCmRc9uBV3YI6e3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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