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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c9d0ea6984a64ed09417e57f7010f0716751f6f34beb041ba4d267957dceda' 
  AND token = '8rTEp1HSltXJdiBX/kYm+erG9Daak92CavahxL+Vegs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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