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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5ceb4a629622be470dd61ca62b03a2cf2d86aaca5efab693aacd9de580844c' 
  AND token = '3+dXuWvn/L6Q4UW0EGwI3Ob1/ZLS10+nrh0Xveva5qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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