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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a4712f544cc54910e627dbe4031a2b0dac9fbd39ec7167833fefbfc161b24e' 
  AND token = '89biZyueG+2HOGFInlw423BrauCPGm5hslaaTO/7uB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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