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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b754ac0a8d3da537dae62a14a5e51401b3ea3acdf3abb27b0103edfbd6c31871' 
  AND token = '/c535F2tHhO+jnXNzjafqv8/F2aPs7W+1KFXdu+Vy0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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