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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e20e2485afffa0a565691b758494cbd423189f431c0c6595deb96d9ef4ee46' 
  AND token = 'zi6IpXVB7Exei4ovasrN0Th1ys+cFTy9aSpjTdA+otQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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