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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0852f53dfd9265d6ad1bd59d5db5181c34fddb905524defe2e6d0a482ab66a' 
  AND token = 'vr3R5llKtlSFjtxX5bTL9/uc0S7fV/PKg3ky1fVjnd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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