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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479526b5c23574e21fed05160ba2f3f6b6590bc60ae34eb849d29736e73dd14b' 
  AND token = '4WuUlVPCu7T0ozK+erTnMXkowsAIevLecTnhYuoZSAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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