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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5f08a9d4d64e8eef0c47d10302cab5ad7ec5de722049a7c1b0d70ff1ffb80b' 
  AND token = 'Bvx8VOk9xDkspSptop+S+9bob2j02YEtueHv/oY+BG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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