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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eac94de817bfa7b1af76d7a57613d25309badf08c05ca7137ed2aa9f949e55' 
  AND token = 'Q7HEqekkPbSJnHjuSVzP4y1JjAxIejR8oA++ry2K804=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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