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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188acdd10ff3ef3f2caca5baa807510f7708fbe471d25b2205e6f41ce7606986' 
  AND token = 'ICNuygc67O1rOcQHKLNX7VY82976tN0Vn9JgDJgUY3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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