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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea8897bf26aca41930f9ccddb5c4cbd5fbe9bfaffcd80e8a16ab4d3c195bde7' 
  AND token = '0fPmK7+k4C8q5GvasSQqocY2d0mbcKIddLJexkJP9gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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