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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58052cf4ff82e089904f26eb243b26cce58d00c94bcf708e0072a65c26ecce7' 
  AND token = 'ehY8QON2MaKSKFp94Tjh1yI68lry8cYulL7aMzbEI0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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