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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0b1414c6245b3a388cce3e2e016216edcce5ba816616a63dab514909ef05a5' 
  AND token = 'RdJqTo8ZHFYqNUNk+M7VS9S7dHsfFFbcsPbA6wCTuio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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