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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07b5fcf6d781d39af6c2e7a03cc4364ff8c3021d92efcdc081d19c853d16790' 
  AND token = 'AmJ9wa3Imckv94hQ/YlAWxBzO4539To1z3n7re5h4dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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